Upper Lake Valley AVA

Upper Lake Valley AVA v vineyards with mountains in background

TopographyFour identified water-bearing formations make up the Upper Lake Groundwater Basin: Quaternary alluvium; Pleistocene terrace deposits; Pleistocene lake and floodplain deposits; and Plio– pleistocene cache creek. The groundwater levels within the Upper Lake Groundwater Basin are generally within 10 feet of the surface and fluctuate between 5 and 15 feet lower in the fall. Lowering of water levels during dry months is not excessive and is balanced by rapid recovery of water level elevations during the wet months. The groundwater of the Upper Lake Groundwater Basin has high levels of iron, manganese, and calcium and low levels of boron and dissolved solids.
ElevationElevation ranging from 1,326’ – 2,820’
SoilsSoils belong to three groups. The Millsholm–Skyhigh-Bressa are formed by sandstone and shale and are primarily loams and clay loams. The Still–Lupoyoma occur on the nearly-level valley floors and consist of very deep, moderately well- to well-drained loams and silt loams. Finally, soils from the Tulelake– luvaquentic–Haplawuolls map unit are very deep, poorly drained silty clay loams.
Acres20,187 acres
ClimateHigh annual rainfall amounts, a relatively short frost-free period, low-speed but frequent winds, and low median growing degree (GDD) accumulations. Annual predicted rainfall amounts within the Upper Lake Groundwater Basin range from 35 to 43 inches, which provides sufficient hydration for grapevines
VarietalsSuitable for growing a variety of grapes, including Sauvignon Blanc.


    LCWC Board Meeting 3:00 pm
    LCWC Board Meeting @ Video Conference
    Apr 11 @ 3:00 pm – 4:00 pm
    Agenda – LCWC Board Meeting, April 11, 2024
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